Home Database Mysql Tutorial Mysql创建、删除用户、查询所有用户等教程,提升您的MYSQL安全度_MySQL

Mysql创建、删除用户、查询所有用户等教程,提升您的MYSQL安全度_MySQL

Jun 01, 2016 pm 01:29 PM
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Mysql创建、删除用户、查询所有用户等教程,提升您的MYSQL安全度

 

建议您不要使用mysql的root账号来为您的web页面连接数据库,这可能会导致用户通过网页获取到您的数据库账号密码,存在严重的安全隐患。

建议新建一账号,权限设置基本够用,然后使用那新建的账号来连接您的数据库。

 

1、连接mysql

[html] 

mysql -uroot -p密码  

(-p后面无需空格,从-p开始即为密码开始)  

  

如果您的MySql在远程服务器上,需要加上 -hIP地址,如  

mysql -uroot -p123456 -h111.111.111.111  

 

2、查看MYSQL数据库中所有用户,仔细检查是否有未经您授权的用户存在

[html] 

SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;  

 

3、创建新用户(针对某个数据库的用户)

格式:grant 权限 on 数据库.* to 用户名@登录主机 identified by "密码"

如,增加一个用户user1密码为password1,让其可以在本机上登录, 并对所有数据库有查询、插入、修改、删除的权限。首先用以root用户连入mysql,然后键入以下命令:

[html] 

grant select,insert,update,delete on *.* to user1@localhost Identified by "password1";  

注意:此处的"localhost",是指该用户只能在本地登录,不能在另外一台机器上远程登录。如果想远程登录的话,将"localhost"改为"%",表示在任何一台电脑上都可以登录。也可以指定某台机器可以远程登录。

 

如果你不想user1有密码,可以再打一个命令将密码去掉。

[html] 

grant select,insert,update,delete on mydb.* to user1@localhost identified by "";  

 

如果说用户原来存在,您只需

[html] 

grant select,insert,update,delete on mydb.* to user1@localhost  

权限列表

grant 权限1,权限2,...权限n on 数据库名称.表名称 to 用户名@用户地址 identified by '连接口令';

  权限1,权限2,...权限n代表select,insert,update,delete,create,drop,index,alter,grant,references,reload,shutdown,process,file等14个权限。

  当权限1,权限2,...权限n被all privileges或者all代替,表示赋予用户全部权限。

  当数据库名称.表名称被*.*代替,表示赋予用户操作服务器上所有数据库所有表d权限。

 

[html] 

mysql>grant all privileges on testDB.* to test@localhost identified by '1234';  

  

mysql>flush privileges;//刷新系统权限表  

格式:grant 权限 on 数据库.* to 用户名@登录主机 identified by "密码"; 

 

4、删除用户

 @>mysql -u root -p

 @>密码

 mysql>Delete FROM user Where User='test' and Host='localhost';

 mysql>flush privileges;

 mysql>drop database testDB; //删除用户的数据库

删除账户及权限:>drop user 用户名@'%';

        >drop user 用户名@ localhost; 

5、修改指定用户密码

  @>mysql -u root -p

  @>密码

  mysql>update mysql.user set password=password('新密码') where User="test" and Host="localhost";

  mysql>flush privileges;

如删除sa这个用户,我前面设置host为localhost:

[html] 

drop user sa@localhost;    

 

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